American Journal of Conchology, 1866. 



Plate 12. 



2, 



4 



Lingual Dentition. 



Fig. 1. Gyrotoma ovoidea, Shuttl. Fig. 3. PachycMhis Icevissima, Sowb. 

 " 2. To spivosa. Lea. " 4. " ScMedeanus, Phil. 



